If you're specifically looking for an
IMAP to IMAP migration tool, I'd suggest choosing one that can transfer complete mailboxes instead of moving email folders by folder. That's especially important if you're migrating business accounts or switching email providers.
In the comparison of IMAP migration solutions, I found one of the best solutions:
TrustVare IMAP Migration Tool, which made my IMAP migration process much easier than doing it manually.
Why this is best:
It supports direct mailbox migration from IMAP servers without downloading emails first and re-uploading them. It can process multiple mailboxes in a single operation, preserve the existing folder hierarchy, attachments, email headers, and other message properties, and it works with IMAP-based email services. This makes it useful for both transferring from one mailbox to another and larger migration projects, where keeping the organisation of the mailbox is important.
If your migration involves multiple user accounts, check whether the license matches the number of mailboxes you need to migrate before getting started. This can save both time and unnecessary cost.